-/* Target-machine dependent code for Motorola 88000 series, for GDB.
- Copyright 1988, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 2000,
- 2001 Free Software Foundation, Inc.
+/* Target-dependent code for the Motorola 88000 series.
+
+ Copyright (C) 2004, 2005, 2007, 2008, 2009 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
+#include "arch-utils.h"
+#include "dis-asm.h"
#include "frame.h"
-#include "inferior.h"
-#include "value.h"
+#include "frame-base.h"
+#include "frame-unwind.h"
#include "gdbcore.h"
+#include "gdbtypes.h"
+#include "regcache.h"
+#include "regset.h"
#include "symtab.h"
-#include "setjmp.h"
+#include "trad-frame.h"
#include "value.h"
-#include "regcache.h"
-/* Size of an instruction */
-#define BYTES_PER_88K_INSN 4
+#include "gdb_assert.h"
+#include "gdb_string.h"
-void frame_find_saved_regs ();
+#include "m88k-tdep.h"
-/* Is this target an m88110? Otherwise assume m88100. This has
- relevance for the ways in which we screw with instruction pointers. */
+/* Fetch the instruction at PC. */
+
+static unsigned long
+m88k_fetch_instruction (CORE_ADDR pc, enum bfd_endian byte_order)
+{
+ return read_memory_unsigned_integer (pc, 4, byte_order);
+}
-int target_is_m88110 = 0;
+/* Register information. */
-/* The m88k kernel aligns all instructions on 4-byte boundaries. The
- kernel also uses the least significant two bits for its own hocus
- pocus. When gdb receives an address from the kernel, it needs to
- preserve those right-most two bits, but gdb also needs to be careful
- to realize that those two bits are not really a part of the address
- of an instruction. Shrug. */
+/* Return the name of register REGNUM. */
-CORE_ADDR
-m88k_addr_bits_remove (CORE_ADDR addr)
+static const char *
+m88k_register_name (struct gdbarch *gdbarch, int regnum)
{
- return ((addr) & ~3);
+ static char *register_names[] =
+ {
+ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
+ "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
+ "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
+ "epsr", "fpsr", "fpcr", "sxip", "snip", "sfip"
+ };
+
+ if (regnum >= 0 && regnum < ARRAY_SIZE (register_names))
+ return register_names[regnum];
+
+ return NULL;
}
+/* Return the GDB type object for the "standard" data type of data in
+ register REGNUM. */
-/* Given a GDB frame, determine the address of the calling function's frame.
- This will be used to create a new GDB frame struct, and then
- INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.
+static struct type *
+m88k_register_type (struct gdbarch *gdbarch, int regnum)
+{
+ /* SXIP, SNIP, SFIP and R1 contain code addresses. */
+ if ((regnum >= M88K_SXIP_REGNUM && regnum <= M88K_SFIP_REGNUM)
+ || regnum == M88K_R1_REGNUM)
+ return builtin_type (gdbarch)->builtin_func_ptr;
- For us, the frame address is its stack pointer value, so we look up
- the function prologue to determine the caller's sp value, and return it. */
+ /* R30 and R31 typically contains data addresses. */
+ if (regnum == M88K_R30_REGNUM || regnum == M88K_R31_REGNUM)
+ return builtin_type (gdbarch)->builtin_data_ptr;
-CORE_ADDR
-frame_chain (struct frame_info *thisframe)
+ return builtin_type (gdbarch)->builtin_int32;
+}
+\f
+
+static CORE_ADDR
+m88k_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR addr)
{
+ /* All instructures are 4-byte aligned. The lower 2 bits of SXIP,
+ SNIP and SFIP are used for special purposes: bit 0 is the
+ exception bit and bit 1 is the valid bit. */
+ return addr & ~0x3;
+}
- frame_find_saved_regs (thisframe, (struct frame_saved_regs *) 0);
- /* NOTE: this depends on frame_find_saved_regs returning the VALUE, not
- the ADDRESS, of SP_REGNUM. It also depends on the cache of
- frame_find_saved_regs results. */
- if (thisframe->fsr->regs[SP_REGNUM])
- return thisframe->fsr->regs[SP_REGNUM];
- else
- return thisframe->frame; /* Leaf fn -- next frame up has same SP. */
+/* Use the program counter to determine the contents and size of a
+ breakpoint instruction. Return a pointer to a string of bytes that
+ encode a breakpoint instruction, store the length of the string in
+ *LEN and optionally adjust *PC to point to the correct memory
+ location for inserting the breakpoint. */
+
+static const gdb_byte *
+m88k_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pc, int *len)
+{
+ /* tb 0,r0,511 */
+ static gdb_byte break_insn[] = { 0xf0, 0x00, 0xd1, 0xff };
+
+ *len = sizeof (break_insn);
+ return break_insn;
}
-int
-frameless_function_invocation (struct frame_info *frame)
+static CORE_ADDR
+m88k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
+ CORE_ADDR pc;
- frame_find_saved_regs (frame, (struct frame_saved_regs *) 0);
- /* NOTE: this depends on frame_find_saved_regs returning the VALUE, not
- the ADDRESS, of SP_REGNUM. It also depends on the cache of
- frame_find_saved_regs results. */
- if (frame->fsr->regs[SP_REGNUM])
- return 0; /* Frameful -- return addr saved somewhere */
- else
- return 1; /* Frameless -- no saved return address */
+ pc = frame_unwind_register_unsigned (next_frame, M88K_SXIP_REGNUM);
+ return m88k_addr_bits_remove (gdbarch, pc);
}
-void
-init_extra_frame_info (int fromleaf, struct frame_info *frame)
+static void
+m88k_write_pc (struct regcache *regcache, CORE_ADDR pc)
{
- frame->fsr = 0; /* Not yet allocated */
- frame->args_pointer = 0; /* Unknown */
- frame->locals_pointer = 0; /* Unknown */
+ /* According to the MC88100 RISC Microprocessor User's Manual,
+ section 6.4.3.1.2:
+
+ "... can be made to return to a particular instruction by placing
+ a valid instruction address in the SNIP and the next sequential
+ instruction address in the SFIP (with V bits set and E bits
+ clear). The rte resumes execution at the instruction pointed to
+ by the SNIP, then the SFIP."
+
+ The E bit is the least significant bit (bit 0). The V (valid)
+ bit is bit 1. This is why we logical or 2 into the values we are
+ writing below. It turns out that SXIP plays no role when
+ returning from an exception so nothing special has to be done
+ with it. We could even (presumably) give it a totally bogus
+ value. */
+
+ regcache_cooked_write_unsigned (regcache, M88K_SXIP_REGNUM, pc);
+ regcache_cooked_write_unsigned (regcache, M88K_SNIP_REGNUM, pc | 2);
+ regcache_cooked_write_unsigned (regcache, M88K_SFIP_REGNUM, (pc + 4) | 2);
}
\f
-/* Examine an m88k function prologue, recording the addresses at which
- registers are saved explicitly by the prologue code, and returning
- the address of the first instruction after the prologue (but not
- after the instruction at address LIMIT, as explained below).
- LIMIT places an upper bound on addresses of the instructions to be
- examined. If the prologue code scan reaches LIMIT, the scan is
- aborted and LIMIT is returned. This is used, when examining the
- prologue for the current frame, to keep examine_prologue () from
- claiming that a given register has been saved when in fact the
- instruction that saves it has not yet been executed. LIMIT is used
- at other times to stop the scan when we hit code after the true
- function prologue (e.g. for the first source line) which might
- otherwise be mistaken for function prologue.
+/* The functions on this page are intended to be used to classify
+ function arguments. */
- The format of the function prologue matched by this routine is
- derived from examination of the source to gcc 1.95, particularly
- the routine output_prologue () in config/out-m88k.c.
+/* Check whether TYPE is "Integral or Pointer". */
- subu r31,r31,n # stack pointer update
+static int
+m88k_integral_or_pointer_p (const struct type *type)
+{
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_INT:
+ case TYPE_CODE_BOOL:
+ case TYPE_CODE_CHAR:
+ case TYPE_CODE_ENUM:
+ case TYPE_CODE_RANGE:
+ {
+ /* We have byte, half-word, word and extended-word/doubleword
+ integral types. */
+ int len = TYPE_LENGTH (type);
+ return (len == 1 || len == 2 || len == 4 || len == 8);
+ }
+ return 1;
+ case TYPE_CODE_PTR:
+ case TYPE_CODE_REF:
+ {
+ /* Allow only 32-bit pointers. */
+ return (TYPE_LENGTH (type) == 4);
+ }
+ return 1;
+ default:
+ break;
+ }
- (st rn,r31,offset)? # save incoming regs
- (st.d rn,r31,offset)?
+ return 0;
+}
- (addu r30,r31,n)? # frame pointer update
+/* Check whether TYPE is "Floating". */
- (pic sequence)? # PIC code prologue
+static int
+m88k_floating_p (const struct type *type)
+{
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_FLT:
+ {
+ int len = TYPE_LENGTH (type);
+ return (len == 4 || len == 8);
+ }
+ default:
+ break;
+ }
- (or rn,rm,0)? # Move parameters to other regs
- */
+ return 0;
+}
-/* Macros for extracting fields from instructions. */
+/* Check whether TYPE is "Structure or Union". */
-#define BITMASK(pos, width) (((0x1 << (width)) - 1) << (pos))
-#define EXTRACT_FIELD(val, pos, width) ((val) >> (pos) & BITMASK (0, width))
-#define SUBU_OFFSET(x) ((unsigned)(x & 0xFFFF))
-#define ST_OFFSET(x) ((unsigned)((x) & 0xFFFF))
-#define ST_SRC(x) EXTRACT_FIELD ((x), 21, 5)
-#define ADDU_OFFSET(x) ((unsigned)(x & 0xFFFF))
+static int
+m88k_structure_or_union_p (const struct type *type)
+{
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_STRUCT:
+ case TYPE_CODE_UNION:
+ return 1;
+ default:
+ break;
+ }
-/*
- * prologue_insn_tbl is a table of instructions which may comprise a
- * function prologue. Associated with each table entry (corresponding
- * to a single instruction or group of instructions), is an action.
- * This action is used by examine_prologue (below) to determine
- * the state of certain machine registers and where the stack frame lives.
- */
-
-enum prologue_insn_action
-{
- PIA_SKIP, /* don't care what the instruction does */
- PIA_NOTE_ST, /* note register stored and where */
- PIA_NOTE_STD, /* note pair of registers stored and where */
- PIA_NOTE_SP_ADJUSTMENT, /* note stack pointer adjustment */
- PIA_NOTE_FP_ASSIGNMENT, /* note frame pointer assignment */
- PIA_NOTE_PROLOGUE_END, /* no more prologue */
-};
+ return 0;
+}
-struct prologue_insns
- {
- unsigned long insn;
- unsigned long mask;
- enum prologue_insn_action action;
- };
+/* Check whether TYPE has 8-byte alignment. */
-struct prologue_insns prologue_insn_tbl[] =
+static int
+m88k_8_byte_align_p (struct type *type)
{
- /* Various register move instructions */
- {0x58000000, 0xf800ffff, PIA_SKIP}, /* or/or.u with immed of 0 */
- {0xf4005800, 0xfc1fffe0, PIA_SKIP}, /* or rd, r0, rs */
- {0xf4005800, 0xfc00ffff, PIA_SKIP}, /* or rd, rs, r0 */
+ if (m88k_structure_or_union_p (type))
+ {
+ int i;
+
+ for (i = 0; i < TYPE_NFIELDS (type); i++)
+ {
+ struct type *subtype = check_typedef (TYPE_FIELD_TYPE (type, i));
- /* Stack pointer setup: "subu sp, sp, n" where n is a multiple of 8 */
- {0x67ff0000, 0xffff0007, PIA_NOTE_SP_ADJUSTMENT},
+ if (m88k_8_byte_align_p (subtype))
+ return 1;
+ }
+ }
- /* Frame pointer assignment: "addu r30, r31, n" */
- {0x63df0000, 0xffff0000, PIA_NOTE_FP_ASSIGNMENT},
+ if (m88k_integral_or_pointer_p (type) || m88k_floating_p (type))
+ return (TYPE_LENGTH (type) == 8);
- /* Store to stack instructions; either "st rx, sp, n" or "st.d rx, sp, n" */
- {0x241f0000, 0xfc1f0000, PIA_NOTE_ST}, /* st rx, sp, n */
- {0x201f0000, 0xfc1f0000, PIA_NOTE_STD}, /* st.d rs, sp, n */
+ return 0;
+}
- /* Instructions needed for setting up r25 for pic code. */
- {0x5f200000, 0xffff0000, PIA_SKIP}, /* or.u r25, r0, offset_high */
- {0xcc000002, 0xffffffff, PIA_SKIP}, /* bsr.n Lab */
- {0x5b390000, 0xffff0000, PIA_SKIP}, /* or r25, r25, offset_low */
- {0xf7396001, 0xffffffff, PIA_SKIP}, /* Lab: addu r25, r25, r1 */
+/* Check whether TYPE can be passed in a register. */
- /* Various branch or jump instructions which have a delay slot -- these
- do not form part of the prologue, but the instruction in the delay
- slot might be a store instruction which should be noted. */
- {0xc4000000, 0xe4000000, PIA_NOTE_PROLOGUE_END},
- /* br.n, bsr.n, bb0.n, or bb1.n */
- {0xec000000, 0xfc000000, PIA_NOTE_PROLOGUE_END}, /* bcnd.n */
- {0xf400c400, 0xfffff7e0, PIA_NOTE_PROLOGUE_END} /* jmp.n or jsr.n */
+static int
+m88k_in_register_p (struct type *type)
+{
+ if (m88k_integral_or_pointer_p (type) || m88k_floating_p (type))
+ return 1;
-};
+ if (m88k_structure_or_union_p (type) && TYPE_LENGTH (type) == 4)
+ return 1;
+ return 0;
+}
-/* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or
- is not the address of a valid instruction, the address of the next
- instruction beyond ADDR otherwise. *PWORD1 receives the first word
- of the instruction. */
+static CORE_ADDR
+m88k_store_arguments (struct regcache *regcache, int nargs,
+ struct value **args, CORE_ADDR sp)
+{
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ int num_register_words = 0;
+ int num_stack_words = 0;
+ int i;
-#define NEXT_PROLOGUE_INSN(addr, lim, pword1) \
- (((addr) < (lim)) ? next_insn (addr, pword1) : 0)
+ for (i = 0; i < nargs; i++)
+ {
+ struct type *type = value_type (args[i]);
+ int len = TYPE_LENGTH (type);
-/* Read the m88k instruction at 'memaddr' and return the address of
- the next instruction after that, or 0 if 'memaddr' is not the
- address of a valid instruction. The instruction
- is stored at 'pword1'. */
+ if (m88k_integral_or_pointer_p (type) && len < 4)
+ {
+ args[i] = value_cast (builtin_type (gdbarch)->builtin_int32,
+ args[i]);
+ type = value_type (args[i]);
+ len = TYPE_LENGTH (type);
+ }
-CORE_ADDR
-next_insn (CORE_ADDR memaddr, unsigned long *pword1)
-{
- *pword1 = read_memory_integer (memaddr, BYTES_PER_88K_INSN);
- return memaddr + BYTES_PER_88K_INSN;
-}
+ if (m88k_in_register_p (type))
+ {
+ int num_words = 0;
-/* Read a register from frames called by us (or from the hardware regs). */
+ if (num_register_words % 2 == 1 && m88k_8_byte_align_p (type))
+ num_words++;
-static int
-read_next_frame_reg (struct frame_info *frame, int regno)
-{
- for (; frame; frame = frame->next)
- {
- if (regno == SP_REGNUM)
- return FRAME_FP (frame);
- else if (frame->fsr->regs[regno])
- return read_memory_integer (frame->fsr->regs[regno], 4);
+ num_words += ((len + 3) / 4);
+ if (num_register_words + num_words <= 8)
+ {
+ num_register_words += num_words;
+ continue;
+ }
+
+ /* We've run out of available registers. Pass the argument
+ on the stack. */
+ }
+
+ if (num_stack_words % 2 == 1 && m88k_8_byte_align_p (type))
+ num_stack_words++;
+
+ num_stack_words += ((len + 3) / 4);
}
- return read_register (regno);
-}
-/* Examine the prologue of a function. `ip' points to the first instruction.
- `limit' is the limit of the prologue (e.g. the addr of the first
- linenumber, or perhaps the program counter if we're stepping through).
- `frame_sp' is the stack pointer value in use in this frame.
- `fsr' is a pointer to a frame_saved_regs structure into which we put
- info about the registers saved by this frame.
- `fi' is a struct frame_info pointer; we fill in various fields in it
- to reflect the offsets of the arg pointer and the locals pointer. */
+ /* Allocate stack space. */
+ sp = align_down (sp - 32 - num_stack_words * 4, 16);
+ num_stack_words = num_register_words = 0;
-static CORE_ADDR
-examine_prologue (register CORE_ADDR ip, register CORE_ADDR limit,
- CORE_ADDR frame_sp, struct frame_saved_regs *fsr,
- struct frame_info *fi)
-{
- register CORE_ADDR next_ip;
- register int src;
- unsigned int insn;
- int size, offset;
- char must_adjust[32]; /* If set, must adjust offsets in fsr */
- int sp_offset = -1; /* -1 means not set (valid must be mult of 8) */
- int fp_offset = -1; /* -1 means not set */
- CORE_ADDR frame_fp;
- CORE_ADDR prologue_end = 0;
-
- memset (must_adjust, '\0', sizeof (must_adjust));
- next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn);
-
- while (next_ip)
+ for (i = 0; i < nargs; i++)
{
- struct prologue_insns *pip;
-
- for (pip = prologue_insn_tbl; (insn & pip->mask) != pip->insn;)
- if (++pip >= prologue_insn_tbl + sizeof prologue_insn_tbl)
- goto end_of_prologue_found; /* not a prologue insn */
+ const bfd_byte *valbuf = value_contents (args[i]);
+ struct type *type = value_type (args[i]);
+ int len = TYPE_LENGTH (type);
+ int stack_word = num_stack_words;
- switch (pip->action)
+ if (m88k_in_register_p (type))
{
- case PIA_NOTE_ST:
- case PIA_NOTE_STD:
- if (sp_offset != -1)
+ int register_word = num_register_words;
+
+ if (register_word % 2 == 1 && m88k_8_byte_align_p (type))
+ register_word++;
+
+ gdb_assert (len == 4 || len == 8);
+
+ if (register_word + len / 8 < 8)
{
- src = ST_SRC (insn);
- offset = ST_OFFSET (insn);
- must_adjust[src] = 1;
- fsr->regs[src++] = offset; /* Will be adjusted later */
- if (pip->action == PIA_NOTE_STD && src < 32)
- {
- offset += 4;
- must_adjust[src] = 1;
- fsr->regs[src++] = offset;
- }
+ int regnum = M88K_R2_REGNUM + register_word;
+
+ regcache_raw_write (regcache, regnum, valbuf);
+ if (len > 4)
+ regcache_raw_write (regcache, regnum + 1, valbuf + 4);
+
+ num_register_words = (register_word + len / 4);
+ continue;
}
- else
- goto end_of_prologue_found;
- break;
- case PIA_NOTE_SP_ADJUSTMENT:
- if (sp_offset == -1)
- sp_offset = -SUBU_OFFSET (insn);
- else
- goto end_of_prologue_found;
- break;
- case PIA_NOTE_FP_ASSIGNMENT:
- if (fp_offset == -1)
- fp_offset = ADDU_OFFSET (insn);
- else
- goto end_of_prologue_found;
- break;
- case PIA_NOTE_PROLOGUE_END:
- if (!prologue_end)
- prologue_end = ip;
- break;
- case PIA_SKIP:
- default:
- /* Do nothing */
- break;
}
- ip = next_ip;
- next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn);
- }
+ if (stack_word % 2 == -1 && m88k_8_byte_align_p (type))
+ stack_word++;
-end_of_prologue_found:
+ write_memory (sp + stack_word * 4, valbuf, len);
+ num_stack_words = (stack_word + (len + 3) / 4);
+ }
- if (prologue_end)
- ip = prologue_end;
+ return sp;
+}
- /* We're done with the prologue. If we don't care about the stack
- frame itself, just return. (Note that fsr->regs has been trashed,
- but the one caller who calls with fi==0 passes a dummy there.) */
+static CORE_ADDR
+m88k_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
+ struct regcache *regcache, CORE_ADDR bp_addr, int nargs,
+ struct value **args, CORE_ADDR sp, int struct_return,
+ CORE_ADDR struct_addr)
+{
+ /* Set up the function arguments. */
+ sp = m88k_store_arguments (regcache, nargs, args, sp);
+ gdb_assert (sp % 16 == 0);
- if (fi == 0)
- return ip;
+ /* Store return value address. */
+ if (struct_return)
+ regcache_raw_write_unsigned (regcache, M88K_R12_REGNUM, struct_addr);
- /*
- OK, now we have:
+ /* Store the stack pointer and return address in the appropriate
+ registers. */
+ regcache_raw_write_unsigned (regcache, M88K_R31_REGNUM, sp);
+ regcache_raw_write_unsigned (regcache, M88K_R1_REGNUM, bp_addr);
- sp_offset original (before any alloca calls) displacement of SP
- (will be negative).
+ /* Return the stack pointer. */
+ return sp;
+}
- fp_offset displacement from original SP to the FP for this frame
- or -1.
+static struct frame_id
+m88k_dummy_id (struct gdbarch *arch, struct frame_info *this_frame)
+{
+ CORE_ADDR sp;
- fsr->regs[0..31] displacement from original SP to the stack
- location where reg[0..31] is stored.
+ sp = get_frame_register_unsigned (this_frame, M88K_R31_REGNUM);
+ return frame_id_build (sp, get_frame_pc (this_frame));
+}
+\f
- must_adjust[0..31] set if corresponding offset was set.
+/* Determine, for architecture GDBARCH, how a return value of TYPE
+ should be returned. If it is supposed to be returned in registers,
+ and READBUF is non-zero, read the appropriate value from REGCACHE,
+ and copy it into READBUF. If WRITEBUF is non-zero, write the value
+ from WRITEBUF into REGCACHE. */
- If alloca has been called between the function prologue and the current
- IP, then the current SP (frame_sp) will not be the original SP as set by
- the function prologue. If the current SP is not the original SP, then the
- compiler will have allocated an FP for this frame, fp_offset will be set,
- and we can use it to calculate the original SP.
+static enum return_value_convention
+m88k_return_value (struct gdbarch *gdbarch, struct type *func_type,
+ struct type *type, struct regcache *regcache,
+ gdb_byte *readbuf, const gdb_byte *writebuf)
+{
+ int len = TYPE_LENGTH (type);
+ gdb_byte buf[8];
- Then, we figure out where the arguments and locals are, and relocate the
- offsets in fsr->regs to absolute addresses. */
+ if (!m88k_integral_or_pointer_p (type) && !m88k_floating_p (type))
+ return RETURN_VALUE_STRUCT_CONVENTION;
- if (fp_offset != -1)
+ if (readbuf)
{
- /* We have a frame pointer, so get it, and base our calc's on it. */
- frame_fp = (CORE_ADDR) read_next_frame_reg (fi->next, ACTUAL_FP_REGNUM);
- frame_sp = frame_fp - fp_offset;
+ /* Read the contents of R2 and (if necessary) R3. */
+ regcache_cooked_read (regcache, M88K_R2_REGNUM, buf);
+ if (len > 4)
+ {
+ regcache_cooked_read (regcache, M88K_R3_REGNUM, buf + 4);
+ gdb_assert (len == 8);
+ memcpy (readbuf, buf, len);
+ }
+ else
+ {
+ /* Just stripping off any unused bytes should preserve the
+ signed-ness just fine. */
+ memcpy (readbuf, buf + 4 - len, len);
+ }
}
- else
+
+ if (writebuf)
{
- /* We have no frame pointer, therefore frame_sp is still the same value
- as set by prologue. But where is the frame itself? */
- if (must_adjust[SRP_REGNUM])
+ /* Read the contents to R2 and (if necessary) R3. */
+ if (len > 4)
{
- /* Function header saved SRP (r1), the return address. Frame starts
- 4 bytes down from where it was saved. */
- frame_fp = frame_sp + fsr->regs[SRP_REGNUM] - 4;
- fi->locals_pointer = frame_fp;
+ gdb_assert (len == 8);
+ memcpy (buf, writebuf, 8);
+ regcache_cooked_write (regcache, M88K_R3_REGNUM, buf + 4);
}
else
{
- /* Function header didn't save SRP (r1), so we are in a leaf fn or
- are otherwise confused. */
- frame_fp = -1;
+ /* ??? Do we need to do any sign-extension here? */
+ memcpy (buf + 4 - len, writebuf, len);
}
+ regcache_cooked_write (regcache, M88K_R2_REGNUM, buf);
}
- /* The locals are relative to the FP (whether it exists as an allocated
- register, or just as an assumed offset from the SP) */
- fi->locals_pointer = frame_fp;
+ return RETURN_VALUE_REGISTER_CONVENTION;
+}
+\f
+/* Default frame unwinder. */
- /* The arguments are just above the SP as it was before we adjusted it
- on entry. */
- fi->args_pointer = frame_sp - sp_offset;
+struct m88k_frame_cache
+{
+ /* Base address. */
+ CORE_ADDR base;
+ CORE_ADDR pc;
- /* Now that we know the SP value used by the prologue, we know where
- it saved all the registers. */
- for (src = 0; src < 32; src++)
- if (must_adjust[src])
- fsr->regs[src] += frame_sp;
+ int sp_offset;
+ int fp_offset;
- /* The saved value of the SP is always known. */
- /* (we hope...) */
- if (fsr->regs[SP_REGNUM] != 0
- && fsr->regs[SP_REGNUM] != frame_sp - sp_offset)
- fprintf_unfiltered (gdb_stderr, "Bad saved SP value %x != %x, offset %x!\n",
- fsr->regs[SP_REGNUM],
- frame_sp - sp_offset, sp_offset);
+ /* Table of saved registers. */
+ struct trad_frame_saved_reg *saved_regs;
+};
- fsr->regs[SP_REGNUM] = frame_sp - sp_offset;
+/* Prologue analysis. */
- return (ip);
-}
+/* Macros for extracting fields from instructions. */
+
+#define BITMASK(pos, width) (((0x1 << (width)) - 1) << (pos))
+#define EXTRACT_FIELD(val, pos, width) ((val) >> (pos) & BITMASK (0, width))
+#define SUBU_OFFSET(x) ((unsigned)(x & 0xFFFF))
+#define ST_OFFSET(x) ((unsigned)((x) & 0xFFFF))
+#define ST_SRC(x) EXTRACT_FIELD ((x), 21, 5)
+#define ADDU_OFFSET(x) ((unsigned)(x & 0xFFFF))
-/* Given an ip value corresponding to the start of a function,
- return the ip of the first instruction after the function
+/* Possible actions to be taken by the prologue analyzer for the
+ instructions it encounters. */
+
+enum m88k_prologue_insn_action
+{
+ M88K_PIA_SKIP, /* Ignore. */
+ M88K_PIA_NOTE_ST, /* Note register store. */
+ M88K_PIA_NOTE_STD, /* Note register pair store. */
+ M88K_PIA_NOTE_SP_ADJUSTMENT, /* Note stack pointer adjustment. */
+ M88K_PIA_NOTE_FP_ASSIGNMENT, /* Note frame pointer assignment. */
+ M88K_PIA_NOTE_BRANCH, /* Note branch. */
+ M88K_PIA_NOTE_PROLOGUE_END /* Note end of prologue. */
+};
+
+/* Table of instructions that may comprise a function prologue. */
+
+struct m88k_prologue_insn
+{
+ unsigned long insn;
+ unsigned long mask;
+ enum m88k_prologue_insn_action action;
+};
+
+struct m88k_prologue_insn m88k_prologue_insn_table[] =
+{
+ /* Various register move instructions. */
+ { 0x58000000, 0xf800ffff, M88K_PIA_SKIP }, /* or/or.u with immed of 0 */
+ { 0xf4005800, 0xfc1fffe0, M88K_PIA_SKIP }, /* or rd,r0,rs */
+ { 0xf4005800, 0xfc00ffff, M88K_PIA_SKIP }, /* or rd,rs,r0 */
+
+ /* Various other instructions. */
+ { 0x58000000, 0xf8000000, M88K_PIA_SKIP }, /* or/or.u */
+
+ /* Stack pointer setup: "subu sp,sp,n" where n is a multiple of 8. */
+ { 0x67ff0000, 0xffff0007, M88K_PIA_NOTE_SP_ADJUSTMENT },
+
+ /* Frame pointer assignment: "addu r30,r31,n". */
+ { 0x63df0000, 0xffff0000, M88K_PIA_NOTE_FP_ASSIGNMENT },
+
+ /* Store to stack instructions; either "st rx,sp,n" or "st.d rx,sp,n". */
+ { 0x241f0000, 0xfc1f0000, M88K_PIA_NOTE_ST }, /* st rx,sp,n */
+ { 0x201f0000, 0xfc1f0000, M88K_PIA_NOTE_STD }, /* st.d rs,sp,n */
+
+ /* Instructions needed for setting up r25 for pic code. */
+ { 0x5f200000, 0xffff0000, M88K_PIA_SKIP }, /* or.u r25,r0,offset_high */
+ { 0xcc000002, 0xffffffff, M88K_PIA_SKIP }, /* bsr.n Lab */
+ { 0x5b390000, 0xffff0000, M88K_PIA_SKIP }, /* or r25,r25,offset_low */
+ { 0xf7396001, 0xffffffff, M88K_PIA_SKIP }, /* Lab: addu r25,r25,r1 */
+
+ /* Various branch or jump instructions which have a delay slot --
+ these do not form part of the prologue, but the instruction in
+ the delay slot might be a store instruction which should be
+ noted. */
+ { 0xc4000000, 0xe4000000, M88K_PIA_NOTE_BRANCH },
+ /* br.n, bsr.n, bb0.n, or bb1.n */
+ { 0xec000000, 0xfc000000, M88K_PIA_NOTE_BRANCH }, /* bcnd.n */
+ { 0xf400c400, 0xfffff7e0, M88K_PIA_NOTE_BRANCH }, /* jmp.n or jsr.n */
+
+ /* Catch all. Ends prologue analysis. */
+ { 0x00000000, 0x00000000, M88K_PIA_NOTE_PROLOGUE_END }
+};
+
+/* Do a full analysis of the function prologue at PC and update CACHE
+ accordingly. Bail out early if LIMIT is reached. Return the
+ address where the analysis stopped. If LIMIT points beyond the
+ function prologue, the return address should be the end of the
prologue. */
-CORE_ADDR
-m88k_skip_prologue (CORE_ADDR ip)
+static CORE_ADDR
+m88k_analyze_prologue (struct gdbarch *gdbarch,
+ CORE_ADDR pc, CORE_ADDR limit,
+ struct m88k_frame_cache *cache)
{
- struct frame_saved_regs saved_regs_dummy;
- struct symtab_and_line sal;
- CORE_ADDR limit;
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ CORE_ADDR end = limit;
- sal = find_pc_line (ip, 0);
- limit = (sal.end) ? sal.end : 0xffffffff;
+ /* Provide a dummy cache if necessary. */
+ if (cache == NULL)
+ {
+ size_t sizeof_saved_regs =
+ (M88K_R31_REGNUM + 1) * sizeof (struct trad_frame_saved_reg);
+
+ cache = alloca (sizeof (struct m88k_frame_cache));
+ cache->saved_regs = alloca (sizeof_saved_regs);
+
+ /* We only initialize the members we care about. */
+ cache->saved_regs[M88K_R1_REGNUM].addr = -1;
+ cache->fp_offset = -1;
+ }
+
+ while (pc < limit)
+ {
+ struct m88k_prologue_insn *pi = m88k_prologue_insn_table;
+ unsigned long insn = m88k_fetch_instruction (pc, byte_order);
+
+ while ((insn & pi->mask) != pi->insn)
+ pi++;
+
+ switch (pi->action)
+ {
+ case M88K_PIA_SKIP:
+ /* If we have a frame pointer, and R1 has been saved,
+ consider this instruction as not being part of the
+ prologue. */
+ if (cache->fp_offset != -1
+ && cache->saved_regs[M88K_R1_REGNUM].addr != -1)
+ return min (pc, end);
+ break;
+
+ case M88K_PIA_NOTE_ST:
+ case M88K_PIA_NOTE_STD:
+ /* If no frame has been allocated, the stores aren't part of
+ the prologue. */
+ if (cache->sp_offset == 0)
+ return min (pc, end);
+
+ /* Record location of saved registers. */
+ {
+ int regnum = ST_SRC (insn) + M88K_R0_REGNUM;
+ ULONGEST offset = ST_OFFSET (insn);
+
+ cache->saved_regs[regnum].addr = offset;
+ if (pi->action == M88K_PIA_NOTE_STD && regnum < M88K_R31_REGNUM)
+ cache->saved_regs[regnum + 1].addr = offset + 4;
+ }
+ break;
+
+ case M88K_PIA_NOTE_SP_ADJUSTMENT:
+ /* A second stack pointer adjustment isn't part of the
+ prologue. */
+ if (cache->sp_offset != 0)
+ return min (pc, end);
- return (examine_prologue (ip, limit, (CORE_ADDR) 0, &saved_regs_dummy,
- (struct frame_info *) 0));
+ /* Store stack pointer adjustment. */
+ cache->sp_offset = -SUBU_OFFSET (insn);
+ break;
+
+ case M88K_PIA_NOTE_FP_ASSIGNMENT:
+ /* A second frame pointer assignment isn't part of the
+ prologue. */
+ if (cache->fp_offset != -1)
+ return min (pc, end);
+
+ /* Record frame pointer assignment. */
+ cache->fp_offset = ADDU_OFFSET (insn);
+ break;
+
+ case M88K_PIA_NOTE_BRANCH:
+ /* The branch instruction isn't part of the prologue, but
+ the instruction in the delay slot might be. Limit the
+ prologue analysis to the delay slot and record the branch
+ instruction as the end of the prologue. */
+ limit = min (limit, pc + 2 * M88K_INSN_SIZE);
+ end = pc;
+ break;
+
+ case M88K_PIA_NOTE_PROLOGUE_END:
+ return min (pc, end);
+ }
+
+ pc += M88K_INSN_SIZE;
+ }
+
+ return end;
}
-/* Put here the code to store, into a struct frame_saved_regs,
- the addresses of the saved registers of frame described by FRAME_INFO.
- This includes special registers such as pc and fp saved in special
- ways in the stack frame. sp is even more special:
- the address we return for it IS the sp for the next frame.
+/* An upper limit to the size of the prologue. */
+const int m88k_max_prologue_size = 128 * M88K_INSN_SIZE;
- We cache the result of doing this in the frame_obstack, since it is
- fairly expensive. */
+/* Return the address of first real instruction of the function
+ starting at PC. */
-void
-frame_find_saved_regs (struct frame_info *fi, struct frame_saved_regs *fsr)
+static CORE_ADDR
+m88k_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
{
- register struct frame_saved_regs *cache_fsr;
- CORE_ADDR ip;
struct symtab_and_line sal;
- CORE_ADDR limit;
+ CORE_ADDR func_start, func_end;
- if (!fi->fsr)
+ /* This is the preferred method, find the end of the prologue by
+ using the debugging information. */
+ if (find_pc_partial_function (pc, NULL, &func_start, &func_end))
{
- cache_fsr = (struct frame_saved_regs *)
- frame_obstack_alloc (sizeof (struct frame_saved_regs));
- memset (cache_fsr, '\0', sizeof (struct frame_saved_regs));
- fi->fsr = cache_fsr;
-
- /* Find the start and end of the function prologue. If the PC
- is in the function prologue, we only consider the part that
- has executed already. In the case where the PC is not in
- the function prologue, we set limit to two instructions beyond
- where the prologue ends in case if any of the prologue instructions
- were moved into a delay slot of a branch instruction. */
-
- ip = get_pc_function_start (fi->pc);
- sal = find_pc_line (ip, 0);
- limit = (sal.end && sal.end < fi->pc) ? sal.end + 2 * BYTES_PER_88K_INSN
- : fi->pc;
-
- /* This will fill in fields in *fi as well as in cache_fsr. */
-#ifdef SIGTRAMP_FRAME_FIXUP
- if (fi->signal_handler_caller)
- SIGTRAMP_FRAME_FIXUP (fi->frame);
-#endif
- examine_prologue (ip, limit, fi->frame, cache_fsr, fi);
-#ifdef SIGTRAMP_SP_FIXUP
- if (fi->signal_handler_caller && fi->fsr->regs[SP_REGNUM])
- SIGTRAMP_SP_FIXUP (fi->fsr->regs[SP_REGNUM]);
-#endif
+ sal = find_pc_line (func_start, 0);
+
+ if (sal.end < func_end && pc <= sal.end)
+ return sal.end;
}
- if (fsr)
- *fsr = *fi->fsr;
+ return m88k_analyze_prologue (gdbarch, pc, pc + m88k_max_prologue_size,
+ NULL);
}
-/* Return the address of the locals block for the frame
- described by FI. Returns 0 if the address is unknown.
- NOTE! Frame locals are referred to by negative offsets from the
- argument pointer, so this is the same as frame_args_address(). */
-
-CORE_ADDR
-frame_locals_address (struct frame_info *fi)
+static struct m88k_frame_cache *
+m88k_frame_cache (struct frame_info *this_frame, void **this_cache)
{
- struct frame_saved_regs fsr;
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct m88k_frame_cache *cache;
+ CORE_ADDR frame_sp;
- if (fi->args_pointer) /* Cached value is likely there. */
- return fi->args_pointer;
+ if (*this_cache)
+ return *this_cache;
- /* Nope, generate it. */
+ cache = FRAME_OBSTACK_ZALLOC (struct m88k_frame_cache);
+ cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
+ cache->fp_offset = -1;
- get_frame_saved_regs (fi, &fsr);
+ cache->pc = get_frame_func (this_frame);
+ if (cache->pc != 0)
+ m88k_analyze_prologue (gdbarch, cache->pc, get_frame_pc (this_frame),
+ cache);
- return fi->args_pointer;
-}
+ /* Calculate the stack pointer used in the prologue. */
+ if (cache->fp_offset != -1)
+ {
+ CORE_ADDR fp;
-/* Return the address of the argument block for the frame
- described by FI. Returns 0 if the address is unknown. */
+ fp = get_frame_register_unsigned (this_frame, M88K_R30_REGNUM);
+ frame_sp = fp - cache->fp_offset;
+ }
+ else
+ {
+ /* If we know where the return address is saved, we can take a
+ solid guess at what the frame pointer should be. */
+ if (cache->saved_regs[M88K_R1_REGNUM].addr != -1)
+ cache->fp_offset = cache->saved_regs[M88K_R1_REGNUM].addr - 4;
+ frame_sp = get_frame_register_unsigned (this_frame, M88K_R31_REGNUM);
+ }
-CORE_ADDR
-frame_args_address (struct frame_info *fi)
-{
- struct frame_saved_regs fsr;
+ /* Now that we know the stack pointer, adjust the location of the
+ saved registers. */
+ {
+ int regnum;
- if (fi->args_pointer) /* Cached value is likely there. */
- return fi->args_pointer;
+ for (regnum = M88K_R0_REGNUM; regnum < M88K_R31_REGNUM; regnum ++)
+ if (cache->saved_regs[regnum].addr != -1)
+ cache->saved_regs[regnum].addr += frame_sp;
+ }
- /* Nope, generate it. */
+ /* Calculate the frame's base. */
+ cache->base = frame_sp - cache->sp_offset;
+ trad_frame_set_value (cache->saved_regs, M88K_R31_REGNUM, cache->base);
- get_frame_saved_regs (fi, &fsr);
+ /* Identify SXIP with the return address in R1. */
+ cache->saved_regs[M88K_SXIP_REGNUM] = cache->saved_regs[M88K_R1_REGNUM];
- return fi->args_pointer;
+ *this_cache = cache;
+ return cache;
}
-/* Return the saved PC from this frame.
+static void
+m88k_frame_this_id (struct frame_info *this_frame, void **this_cache,
+ struct frame_id *this_id)
+{
+ struct m88k_frame_cache *cache = m88k_frame_cache (this_frame, this_cache);
- If the frame has a memory copy of SRP_REGNUM, use that. If not,
- just use the register SRP_REGNUM itself. */
+ /* This marks the outermost frame. */
+ if (cache->base == 0)
+ return;
-CORE_ADDR
-frame_saved_pc (struct frame_info *frame)
-{
- return read_next_frame_reg (frame, SRP_REGNUM);
+ (*this_id) = frame_id_build (cache->base, cache->pc);
}
+static struct value *
+m88k_frame_prev_register (struct frame_info *this_frame,
+ void **this_cache, int regnum)
+{
+ struct m88k_frame_cache *cache = m88k_frame_cache (this_frame, this_cache);
+
+ if (regnum == M88K_SNIP_REGNUM || regnum == M88K_SFIP_REGNUM)
+ {
+ struct value *value;
+ CORE_ADDR pc;
-#define DUMMY_FRAME_SIZE 192
+ value = trad_frame_get_prev_register (this_frame, cache->saved_regs,
+ M88K_SXIP_REGNUM);
+ pc = value_as_long (value);
+ release_value (value);
+ value_free (value);
-static void
-write_word (CORE_ADDR sp, ULONGEST word)
+ if (regnum == M88K_SFIP_REGNUM)
+ pc += 4;
+
+ return frame_unwind_got_constant (this_frame, regnum, pc + 4);
+ }
+
+ return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
+}
+
+static const struct frame_unwind m88k_frame_unwind =
+{
+ NORMAL_FRAME,
+ m88k_frame_this_id,
+ m88k_frame_prev_register,
+ NULL,
+ default_frame_sniffer
+};
+\f
+
+static CORE_ADDR
+m88k_frame_base_address (struct frame_info *this_frame, void **this_cache)
{
- register int len = REGISTER_SIZE;
- char buffer[MAX_REGISTER_RAW_SIZE];
+ struct m88k_frame_cache *cache = m88k_frame_cache (this_frame, this_cache);
+
+ if (cache->fp_offset != -1)
+ return cache->base + cache->sp_offset + cache->fp_offset;
- store_unsigned_integer (buffer, len, word);
- write_memory (sp, buffer, len);
+ return 0;
}
-void
-m88k_push_dummy_frame (void)
+static const struct frame_base m88k_frame_base =
{
- register CORE_ADDR sp = read_register (SP_REGNUM);
- register int rn;
- int offset;
+ &m88k_frame_unwind,
+ m88k_frame_base_address,
+ m88k_frame_base_address,
+ m88k_frame_base_address
+};
+\f
- sp -= DUMMY_FRAME_SIZE; /* allocate a bunch of space */
+/* Core file support. */
- for (rn = 0, offset = 0; rn <= SP_REGNUM; rn++, offset += 4)
- write_word (sp + offset, read_register (rn));
+/* Supply register REGNUM from the buffer specified by GREGS and LEN
+ in the general-purpose register set REGSET to register cache
+ REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
- write_word (sp + offset, read_register (SXIP_REGNUM));
- offset += 4;
+static void
+m88k_supply_gregset (const struct regset *regset,
+ struct regcache *regcache,
+ int regnum, const void *gregs, size_t len)
+{
+ const gdb_byte *regs = gregs;
+ int i;
- write_word (sp + offset, read_register (SNIP_REGNUM));
- offset += 4;
+ for (i = 0; i < M88K_NUM_REGS; i++)
+ {
+ if (regnum == i || regnum == -1)
+ regcache_raw_supply (regcache, i, regs + i * 4);
+ }
+}
- write_word (sp + offset, read_register (SFIP_REGNUM));
- offset += 4;
+/* Motorola 88000 register set. */
- write_word (sp + offset, read_register (PSR_REGNUM));
- offset += 4;
+static struct regset m88k_gregset =
+{
+ NULL,
+ m88k_supply_gregset
+};
- write_word (sp + offset, read_register (FPSR_REGNUM));
- offset += 4;
+/* Return the appropriate register set for the core section identified
+ by SECT_NAME and SECT_SIZE. */
- write_word (sp + offset, read_register (FPCR_REGNUM));
- offset += 4;
+static const struct regset *
+m88k_regset_from_core_section (struct gdbarch *gdbarch,
+ const char *sect_name, size_t sect_size)
+{
+ if (strcmp (sect_name, ".reg") == 0 && sect_size >= M88K_NUM_REGS * 4)
+ return &m88k_gregset;
- write_register (SP_REGNUM, sp);
- write_register (ACTUAL_FP_REGNUM, sp);
+ return NULL;
}
+\f
-void
-pop_frame (void)
+static struct gdbarch *
+m88k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
- register struct frame_info *frame = get_current_frame ();
- register CORE_ADDR fp;
- register int regnum;
- struct frame_saved_regs fsr;
+ struct gdbarch *gdbarch;
- fp = FRAME_FP (frame);
- get_frame_saved_regs (frame, &fsr);
+ /* If there is already a candidate, use it. */
+ arches = gdbarch_list_lookup_by_info (arches, &info);
+ if (arches != NULL)
+ return arches->gdbarch;
- if (PC_IN_CALL_DUMMY (read_pc (), read_register (SP_REGNUM), FRAME_FP (fi)))
- {
- /* FIXME: I think get_frame_saved_regs should be handling this so
- that we can deal with the saved registers properly (e.g. frame
- 1 is a call dummy, the user types "frame 2" and then "print $ps"). */
- register CORE_ADDR sp = read_register (ACTUAL_FP_REGNUM);
- int offset;
+ /* Allocate space for the new architecture. */
+ gdbarch = gdbarch_alloc (&info, NULL);
- for (regnum = 0, offset = 0; regnum <= SP_REGNUM; regnum++, offset += 4)
- (void) write_register (regnum, read_memory_integer (sp + offset, 4));
+ /* There is no real `long double'. */
+ set_gdbarch_long_double_bit (gdbarch, 64);
+ set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
- write_register (SXIP_REGNUM, read_memory_integer (sp + offset, 4));
- offset += 4;
+ set_gdbarch_num_regs (gdbarch, M88K_NUM_REGS);
+ set_gdbarch_register_name (gdbarch, m88k_register_name);
+ set_gdbarch_register_type (gdbarch, m88k_register_type);
- write_register (SNIP_REGNUM, read_memory_integer (sp + offset, 4));
- offset += 4;
+ /* Register numbers of various important registers. */
+ set_gdbarch_sp_regnum (gdbarch, M88K_R31_REGNUM);
+ set_gdbarch_pc_regnum (gdbarch, M88K_SXIP_REGNUM);
- write_register (SFIP_REGNUM, read_memory_integer (sp + offset, 4));
- offset += 4;
+ /* Core file support. */
+ set_gdbarch_regset_from_core_section
+ (gdbarch, m88k_regset_from_core_section);
- write_register (PSR_REGNUM, read_memory_integer (sp + offset, 4));
- offset += 4;
+ set_gdbarch_print_insn (gdbarch, print_insn_m88k);
- write_register (FPSR_REGNUM, read_memory_integer (sp + offset, 4));
- offset += 4;
+ set_gdbarch_skip_prologue (gdbarch, m88k_skip_prologue);
- write_register (FPCR_REGNUM, read_memory_integer (sp + offset, 4));
- offset += 4;
+ /* Stack grows downward. */
+ set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
- }
- else
- {
- for (regnum = FP_REGNUM; regnum > 0; regnum--)
- if (fsr.regs[regnum])
- write_register (regnum,
- read_memory_integer (fsr.regs[regnum], 4));
- write_pc (frame_saved_pc (frame));
- }
- reinit_frame_cache ();
+ /* Call dummy code. */
+ set_gdbarch_push_dummy_call (gdbarch, m88k_push_dummy_call);
+ set_gdbarch_dummy_id (gdbarch, m88k_dummy_id);
+
+ /* Return value info */
+ set_gdbarch_return_value (gdbarch, m88k_return_value);
+
+ set_gdbarch_addr_bits_remove (gdbarch, m88k_addr_bits_remove);
+ set_gdbarch_breakpoint_from_pc (gdbarch, m88k_breakpoint_from_pc);
+ set_gdbarch_unwind_pc (gdbarch, m88k_unwind_pc);
+ set_gdbarch_write_pc (gdbarch, m88k_write_pc);
+
+ frame_base_set_default (gdbarch, &m88k_frame_base);
+ frame_unwind_append_unwinder (gdbarch, &m88k_frame_unwind);
+
+ return gdbarch;
}
+\f
+
+/* Provide a prototype to silence -Wmissing-prototypes. */
+void _initialize_m88k_tdep (void);
void
_initialize_m88k_tdep (void)
{
- tm_print_insn = print_insn_m88k;
+ gdbarch_register (bfd_arch_m88k, m88k_gdbarch_init, NULL);
}
projects / thirdparty / binutils-gdb.git / blobdiff